Water hydraulic valves are hydraulic valves that use water as the working fluid instead of oil. They are used to control the flow and direction of water in a water hydraulic system. It operate on the same principles as traditional hydraulic valves, where they use mechanical, electrical, or manual means to control the flow and direction of the working fluid. However, water hydraulic valves have some differences, such as their ability to operate at higher speeds and their lower viscosity compared to oil-based hydraulic valves.